Toolholder



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A TOOLHOLDER Filed May 4, 1945 v2 Sheets-Sheet l 46 ww l 4?\ 2"' Lft l|55 6 15 -Jrj/ INVENTOR. THIQDORIl- F12/SCO www 'July 5, 1949*. T, E,FRlsCo 2,475,386

TOOLHOLDER Filed May 4, 1945 2 Sheets-Sheet 2 INVENTOR.

THfoDoRz-r F12/sco www Patented July 5, 1949 UNITED STATES PATENT OFFICETOQLHOIJ)131Ky TheodoreE. Frisco, Cleveland, Ohio Application May-.4,1945, Serial No. 592,047

5 Claims. 1

The present invention relates to a oating tool holder.

The principal object of this invention is to support a tool for floatingor hunting movementsincluding both angular deviation and lateral offsetof the tool axis with respect to the support axis in any direction, asWell as axial relief when required, and tosecure thetool rmly inposition for operationl withoutinterfering-With either the angulardeviation or the lateral onset which it may have selected. Anotherobject is to support a tool for angular and lateral movement and toprevent chattering when the tool isin use.

A further object is to provide a positive-driven tool holder ofsimplified construction, which is durable, highly reliable andeasilymanipulated.

Other and further objects, features and advantages will appear from thefollowing detailed description ci preferred embodiments considered inconjunction with the accompanying drawing in which Fig. 1 is alongitudinal sectional view of one embodiment of kmy invention;

Fig. 2 is an exploded view of a part of the apparatus of Fig. 1;

Fig. 3 is a longitudinal sectional view of an embodiment of my inventionin which a shank is grooved to receive a thrust ball;

Fig. 4 is a longitudinal sectional view of anembodiment of my inventionin which a square drive plate is employed; and

Fig. 5 is an exploded view of the arrangement of Fig. 4.

Like reference characters are utilized throughout the drawing todesignate like parts.

This application discloses improvements in the apparatus disclosed in mycopending application Serial No. 546,037, filed July 21, 1944 for a Toolholder.

In a preferred embodiment of my inventionas illustrated in Figs. 1 and2, I provide a shank `I I, a holder I2 and a driving plate I3 interposedbe tween the shank I I and the holder I2. Means not shown are rprovidedfor mounting the shank I I in such relation to work (not shown) that atool (not shown) secured in the holder l2 may perform the desiredoperation on the work. Either the work orthe shankll may be rotatablymounted, the other being held stationary. Suitable means are providedsuch as a pair oi pins I4 mounted in the 2 the holder I2 depending uponwhether the shank II or the Workberotated.

The arrangement is such that the holder` I 2 may loat either laterally,or angularly with respect to the shank II. The holder .axis I'I mayeither move radially withrespect-to the-shank axis I6 or make 4aniangletherewith'without interfering with the rotary driverelationship. In thespecific arrangement illustrated in Figs-land 2 the oatf ing drivingrelationship is accomplished by means of radial slots Ill-inthe4 driveplate I3 engaging the pins` I land radial slots I9 in the drive plate I3engaging the pins I5. Forretaining the driving plate I3 in the floatingposition between the shank I I andthe holder I2 the drive plate I3 isprovided with an aperture ZI and a ball 20 is loosely tted in theaperture 2 I the shank I I and the holder I2 being provided withmeetingl or opposite surfaces 22 and23having transverse grooves24 and25, re- Spectivelyftherein ior'retaining the ball 22. The arrangement`is such .thatthe grooves 24 and 25 are transverseto each other, forexample, perpendicular to. each other with each groove being along theline-betweenthefypair of engaging pins I4 or I5 but myinvention is notlimited thereto as obviously thepins may be mounted in a line across thegrooves as shown. in Fig. 5 Where a suitable type of driveplate isemployed.

In thespecic arrangement illustrated in Figs. land 2 the surface 22 isnot formed directly in the shank II but in, a piece 26 Which vis movableaxially relative to the shank I I to serve as a relief plate.

The pins I5. are fxedfin the holder l2 protruding from the surface 23thereof. However, to providelfor axial movement of the relief plate 2B,pin receiving socktSzZ-l are formed in the shank II in which the pins I4have Va sliding lit and the pins I4 extend on either side of the. reliefplate v26. The slots I8 and` I 9 in the drive plate I3 have suflicientWidth and radialzlength to provide a loose rit for the engaging pinsIand .M and also to permit lateral displacement of the holder axis I'Iwith respent to. shank axis, I6.

Suitable means .are provided for yieldingly holding the .relief vplate26eseinst the end of the shank I I. For example, asillustrated the shankI I may be provided with an axial opening 28 and a machine screwv 29.may be threaded into the center of the baekfsurface ofthe-relief plate26 with a compression spring. 3I between the screw head 32 land ashulder33 at'the end of the central Qpenne 28 of theshank H.

VFor.securing the holder I 2 to the shank II a barrel 3.4 is., providedhaving @shoulder 35 fitted around the holder I2. A convex preferablyspherical surface 36 is formed on the holder I2 the inner end of theholder I2 being of greater diameter than the neck portion 31. Forsecuring the barrel 34, the inner surface thereof is threaded at 38 andthe outer edge 39 of the yield plate 26 is threaded to receive thethreads 38 of the barrel 34. The barrel is also formed with a shoulder40 between the shoulder 35 and the threaded portion 38. Furthermore, anannular groove 4I may be formed around the shank I I near the endthereof and a set screw 42 may be provided in the barrel 34 adapted toextend into` the groove 4I. Preferably the set screw 42 is smaller thanthe width of the groove 4 I, so that the barrel 34 may be screwed in orout a limited amount while the screw is in the groove 4|.

In order to maintain the parts assembled, a holding ring 43 is providedwhich is adapted to fit slidably against the -convex surface 36 and acompression spring 44 is provided for pressing the ring 43 against thesurface 35. The ring 43 is small enough to permit radial and angularmovement of the holder I2 within the barrel 34, and large enough to beengaged by the shoulder 48 in any adjusted position when the barrel 34is screwed down tightly. Preferably a retaining ring 45 is mountedbetween the spring 44 and the shoulder 35 of the barrel 34.

The holder I2 is provided with a socket 46 for receiving the shank ofthe suitable tool such as reamer for example and the holder 'I2 may havea- 'threaded opening 41 for receiving a set screw to secure a tool inthe socket 46.

When the tool in the holder I'2 is utilized in an installation in whichthe work remains stationary and the shank II and the holder I2 arerequired to rotate the barrel 34 is preferably turned to such a positionthat the spring 44 is compressed just sufficiently to hold the ring 43lightly against the convex surface 36 in order to prevent the ball 26from rolling out of either of the grooves 24 or 25, which have a radiusof curvature equal or greater than that of the ball 26. Assuming thatthe tool such as a reamer is mounted in the socket 46 and that the workis so positioned that the axis I1 of the holder I2 is required to be outof alignment with the axis I6 of the shank II whether or not the twoaxes are at an angle with each other it will be observed that therolling of the ball 22 within either of the grooves 24 and 25 withshifting of the drive plate I3 permits transverse or radial adjustmentas the parts I I and I2 rotate about their respective axes withoutinterfering with the rotary driving relationship. The drive plate I3 mayalso move radially as a result of the depth of the slots I8 and I`9. Ifthe axes I6 and I1 are oblique to each other the pins I4 and I5 may moveinto or out of the slots I8 and I9 sufficiently to allow for the angulardistortion.

The operation is the same if the shank II is held in a stationaryposition and the work is made to rotate. However, in this case after thetool such as a reamer has worked in suiiiciently to find the properposition, any further motion of the holder I2 will be unnecessary and toprevent chattering of the tool it may be desirable to cause the holderI2 to be secured in a fixed position. This may be done by screwing downthe barrel 34, compressing the spring 44 until the shoulder 46 engagesthe ring 43 and presses the same positively against the convex surface36 of the holder IZ, to lock the parts in the selected position. In casea tool such asv a reamer is being employed such that axial movement ofthe holder I2 is not desired, the set screw 42 may be moved into theannular slot 4I to hold the relief plate 26 from moving any substantialamount away from the end of the shank II, while permitting the barrel tobe turned a half turn or so to lock or release the holder I'2 foradjustment with respect to the shank II. It will be observed that thereis an opening 41 within the shoulder 35 of the barrel 34 of sufiicientlygreater size than the outer diameter of the neck portion 31 of theholder I2 to permit considerable lateral and angular movement of theholder I2 with respect to the ball 34. The inner and outer diameters ofthe retaining ring 45 are such that the spring 44 is held within theshoulder 35 regardless of the position of the holder I2.

Under certain circumstances it might be desirable to permit axialyielding of the tool even when the barrel 34 is tightened against thespring 44 to hold the tool normally in a denite adjusted position. Forexample, in the use of a tap there may be discrepancies between the rateof feed of the work and the lead of the tap thread, causing the tap orthe work to move abruptly in an axial direction and tending to break thetap in the work and thereby spoil the work. When such operations are tobe performed the set screw 42 is backed out of the annular slot 4I so asto permit yielding of the barrel 34 and the holder I2 against the forceof the compression spring 4I. The spring 4I is so designed that ityields more readily than the spring 44 so that the surface 36 is notloosened.

Where the operation to be performed is such that axial yieldingindependently of the spring 44 is not required, the surface 22 and theball receiving groove 24 may be formed directly in the end of the shankI I as illustrated in Fig. 3. In this case the relief plate 26 is notemployed and the barrel 34 is threaded directly to an outer threadedsurface 39 formed on the shank II. Furthermore, pins I 4' are fittedinto openings at 21 in the shank I'I of such size as to form a drive fitholding the pins 21 in the xed axial position in the shank II.

In the arrangement of Figs. l, 2 and 3 I have shown a radially slotteddrive plate I3. It is to be understood, however, that my invention isnot limited to the precise arrangement described and illustrated andincludes the use of any suitable drive plate adapted to form a rotarydriving connection while allowing for floating laterally or angularly.For example, as illustrated in Figs. 4 and 5 a square drive plate 48 maybe employed or it may be an oblong drive plate having such length andwidth as to fit singly between the pair of engaging pins I4 and betweenthe engaging pins I5. The pins I4 and I5 may be round as illustrated, ormay be formed with flat sides to engage the plate, such as square orrectangular pins.

In the arrangement of Figs. 4 and 5 the barrel 34 is threaded directlyto the threaded surface 39' of the shank II and there is a yield plate26 made small enough to t loosely within the barrel 34. The engagingpins I4 are secured in the yield plate 26', as in the case of the yieldplate 26 shown in Fig. 1.

In order to allow the holder I2 to be pulled out axially against theforce of the spring 44 when required as in the case of tappingoperations without permitting the ball 20 to lose contact with thegrooves 24 and 25, a thrust spring 49 is provided in a socket 5I in theshank II which 5 resiliently presses the yield plate 26' toward the ball20.

In the arrangement of Figs. 4 and 5 the driving relationship between theshank I I and the holder I2 with respect to rotation about the axis I'Ior the axis I6 is obtained by reason of the fact that the parallel sidesof the drive plate 48 slidably fit between the pins I4 and the pins I5.The holder I2 is free to move laterally, however, or angularly inasmuchas the plate 48 is free to slide transversely between the pins as inarrangements of Figs. 1 to 3.

When the shank I I is to be held in a stationary position, and the workis to be rotated a slight turn of the barrel 34 is sufficient to loosenthe holder I2 to enable the tool to find the correct angle of positionand displacement for the work and a slight turn is then sufcient totighten the holding ring I3 against the convex surface 36 for holdingthe tool in the adjusted position and preventing chattering.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific terminology is not of intended tobe restrictive or confining, and that various rearrangements of partsand modifications of detail may be resorted to without departing fromthe scope or spirit of the invention as herein claimed.

I claim:

1. In a tool holder, a shank, a holder, each including means rotatabletherewith having a face with a groove therein, one groove beingtransverse to the other, a ball fitting in both grooves, a drive platehaving an aperture therein surrounding said ball, and means on each ofsaid faces engaging said drive plate with respect to angular motionaround an axis normal to the drive plate but slidable with respect toradial motion, said holder having a convex substantially sphericalsurface behind its face, a clamping ring fitting against said convexsurface and means for resiliently holding said ring against said surfacefor binding the holder and shank in adjustable fixed relation to eachother.

2. In a tool holder, a shank, a holder having a face with a groovetherein, a relief plate having a face with a groove therein, one groovebeing transverse to the other, a ball tting in both of said grooves, adrive plate having an aperture therein, surrounding said ball and meansin said holder and relief plate engaging said drive plate with respectto angular motion around an axis transverse to the drive plate butslidable with respect to radial motion, means for securing said reliefplate to said shank with respect to rotary motion leaving the reliefplate fully movable with respect to axial motion, resilient means forurging said relief plate axially toward said shank, and means forresiliently holding said holder against said relief plate.

3. In a tool, a shank, a holder each including means rotatable therewithhaving a face with a groove therein, one groove being transverse to theother, a ball fitting in both grooves, a drive plate having an aperturetherein surrounding said ball and having two opposed pairs of straightparallel sides and means projecting from each of said faces slidablyfitting against a pair of parallel sides of said drive plate permittingangular and sliding motion of said drive plate around either of saidmeans.

4. In a tool holder, a shank, a driving plate and a relief plate fittingagainst the end of said shank and having pins extending therethrough,resilient means urging said relief plate toward the drive plate, saidshank having holes therein for loosely receiving said pins to produce adriving relationship with respect to rotary motion between said reliefplate and said shank, and said drive plate being adapted to be engagedby said pins, to cause the parts to partake of angular motion around anaxis intersecting the drive plate but said parts being relativelyslidable with respect to radial motion.

5. In a tool holder, a shank, a holder having a face with a groovetherein, a relief plate having a face with a groove therein, one groovebeing transverse to the other, a ball fitting in both of said grooves, adrive plate having an aperture therein surrounding said lball, andVmeans in said holder and relief plate engaging said drive plate withrespect to angular motion around an axis transverse to the drive platebut slidable with respect to radial motion, means for securing saidrelief plate to said shank with respect to rotary motion leaving therelief plate fully movable with respect to axial motion, resilient meansfor urging said relief plate axially toward said shank, and means forresiliently holding said holder against said relief plate.

THEODORE E. FRISCO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 553,265 Scholer Jan. 2, 18961,241,175 Watts Sept. 25, 1917 1,309,217 Ratheram July 8, 1919 1,566,553Maisch Dec. 22, 1925 1,831,382 Gairing Nov. 10, 1931 1,907,447 SchlitzMay 9, 1933 2,007,897 Skeel July 9, 1935

